Mailing-List: contact cygwin-help@cygwin.com; run by ezmlm List-Subscribe: List-Archive: List-Post: List-Help: , Sender: cygwin-owner@cygwin.com Delivered-To: mailing list cygwin@cygwin.com Date: Thu, 24 Jan 2002 17:01:47 +0100 From: Corinna Vinschen To: cygwin Subject: Re: Descriptor passing between process Message-ID: <20020124170147.D11608@cygbert.vinschen.de> Mail-Followup-To: cygwin References: <002401c1a3f4$0b77e8c0$010310ac@lyoncleitienne> <20020123120701.A11608@cygbert.vinschen.de> <8181418335.20020124161420@logos-m.ru> <20020124142156.Y11608@cygbert.vinschen.de> <4183271981.20020124164513@logos-m.ru> <20020124163840.B11608@cygbert.vinschen.de> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20020124163840.B11608@cygbert.vinschen.de> User-Agent: Mutt/1.3.22.1i On Thu, Jan 24, 2002 at 04:38:40PM +0100, Corinna Vinschen wrote: > On Thu, Jan 24, 2002 at 04:45:13PM +0300, Egor Duda wrote: > > Hi! > > > > Thursday, 24 January, 2002 Corinna Vinschen cygwin@cygwin.com wrote: > > > > CV> On Thu, Jan 24, 2002 at 04:14:20PM +0300, Egor Duda wrote: > > >> CV> It's part of the API since 1.3.8-1. > > >> > > >> Hmm. What change are you referring to? I don't see anything like this > > >> in the ChangeLog. > > > > CV> 2002-01-19 Mark Bradshaw > > > > CV> * cygwin.din: Add recvmsg and sendmsg. > > CV> * net.cc: Add cygwin_recvmsg and cygwin_sendmsg. > > CV> * /usr/include/sys/socket.h: Add recvmsg and sendmsg. > > > > yes, but if i understand things correctly, Christophe was talking > > about passing file descriptors between processes by means of AF_UNIX > > sockets. btw, "Subject:" implies this :). > > > > this is done on unices via msg_control (or msg_accrights) field in msg > > structure. and unices ensure that the process which receives the > > message using recvmsg can use the descriptor for all kinds of file > > operations. in the case of cygwin, the receiver may get the value 3 in > > message packet, but won't be able to use it in "read (3, buf, sizeof (buf))" > > Ouch. I didn't read your message correctly before sending the > reply to Christophe's mail. More ouch! I just read a detailed description of the descriptor passing magic via AF_LOCAL sockets in U*X systems. I see now that I didn't even know what you were talking about. It *could* be implemented. First we would have to implement the control message passing at all and when it's available we could perhaps even implement descriptor passing using the DuplicateHandle() function. Volunteers? Corinna -- Corinna Vinschen Please, send mails regarding Cygwin to Cygwin Developer mailto:cygwin@cygwin.com Red Hat, Inc. -- Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple Bug reporting: http://cygwin.com/bugs.html Documentation: http://cygwin.com/docs.html FAQ: http://cygwin.com/faq/